Examine source code of Fiorilli Web Extension

{
  "manifest_version": 2,
  "name": "Fiorilli Web Extension",
  "description": "Extensão utilitária dos softwares Fiorilli",
  "author": "Fiorilli SC Ltda",
  "version": "1.0.4",
  "icons": {
    "16": "assets/img/icon16.png",
    "48": "assets/img/icon48.png",
    "96": "assets/img/icon96.png",
    "128": "assets/img/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/img/icon16.png"
    },
    "default_title": "Fiorilli Web Extension",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "webextension@fiorilli.com.br",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "runtime.js",
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "runtime.js",
        "content.js"
      ]
    }
  ],
  "permissions": [
    "nativeMessaging",
    "storage",
    "downloads"
  ]
}